function validateMissingText(textbox, errorlabel) 
{ 
    var field = document.getElementById(textbox); 
    var label = document.getElementById(errorlabel); 
 
    label.innerHTML = ""; 
 
    if(field.value == "") { 
        label.innerHTML = "Missing entry"; 
        return false; 
    } 
    else {
        return true; 
    } 
}
    